A/C knobs not working, air not flowing from dashboard vents
08-03-2015, 09:58 PM
#1
TECH Regular
Thread Starter
A/C ***** not working, air not flowing from dashboard vents Ok, I've done some searches on this. Seen a variety of answers, so I figured I'd ask here.
Recently, the **** that switches from A/C to defrost to floor/dashboard mode, etc has quit working. The detents that it used to have are gone and the **** just turns throughout it's arc of travel without any resistance. As a result, the HVAC only blows on the floor vents and the A/C will not engage. The ***** that control the temp from hot to cold and the fan settings still work fine.
A/C system was overhauled and compressor replaced in the last 2 years, so that's not the problem.
Is this indicative of the common vacuum line HVAC problem or does the problem more likely reside directly behind my dash panel?
Recently, the **** that switches from A/C to defrost to floor/dashboard mode, etc has quit working. The detents that it used to have are gone and the **** just turns throughout it's arc of travel without any resistance. As a result, the HVAC only blows on the floor vents and the A/C will not engage. The ***** that control the temp from hot to cold and the fan settings still work fine.
A/C system was overhauled and compressor replaced in the last 2 years, so that's not the problem.
Is this indicative of the common vacuum line HVAC problem or does the problem more likely reside directly behind my dash panel?
08-03-2015, 10:03 PM
#2
TECH Addict
A/C ***** not working, air not flowing from dashboard vents Ok, I've done some searches on this. Seen a variety of answers, so I figured I'd ask here.
Recently, the **** that switches from A/C to defrost to floor/dashboard mode, etc has quit working. The detents that it used to have are gone and the **** just turns throughout it's arc of travel without any resistance. As a result, the HVAC only blows on the floor vents and the A/C will not engage. The ***** that control the temp from hot to cold and the fan settings still work fine.
A/C system was overhauled and compressor replaced in the last 2 years, so that's not the problem.
Is this indicative of the common vacuum line HVAC problem or does the problem more likely reside directly behind my dash panel?
Recently, the **** that switches from A/C to defrost to floor/dashboard mode, etc has quit working. The detents that it used to have are gone and the **** just turns throughout it's arc of travel without any resistance. As a result, the HVAC only blows on the floor vents and the A/C will not engage. The ***** that control the temp from hot to cold and the fan settings still work fine.
A/C system was overhauled and compressor replaced in the last 2 years, so that's not the problem.
Is this indicative of the common vacuum line HVAC problem or does the problem more likely reside directly behind my dash panel?
08-04-2015, 07:12 AM
#4
TECH Apprentice
Ok, I've done some searches on this. Seen a variety of answers, so I figured I'd ask here.
Recently, the **** that switches from A/C to defrost to floor/dashboard mode, etc has quit working. The detents that it used to have are gone and the **** just turns throughout it's arc of travel without any resistance. As a result, the HVAC only blows on the floor vents and the A/C will not engage. The ***** that control the temp from hot to cold and the fan settings still work fine.
A/C system was overhauled and compressor replaced in the last 2 years, so that's not the problem.
Is this indicative of the common vacuum line HVAC problem or does the problem more likely reside directly behind my dash panel?
Recently, the **** that switches from A/C to defrost to floor/dashboard mode, etc has quit working. The detents that it used to have are gone and the **** just turns throughout it's arc of travel without any resistance. As a result, the HVAC only blows on the floor vents and the A/C will not engage. The ***** that control the temp from hot to cold and the fan settings still work fine.
A/C system was overhauled and compressor replaced in the last 2 years, so that's not the problem.
Is this indicative of the common vacuum line HVAC problem or does the problem more likely reside directly behind my dash panel?
http://shbox.com/1/vac_check_valve.jpg
Last edited by CamOnlyJabroni; 08-04-2015 at 07:20 AM.
08-04-2015, 08:34 AM
#5
TECH Veteran
08-04-2015, 11:18 AM
#7
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Thread Starter
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08-04-2015, 11:36 AM
#8
TECH Apprentice
When mine didn't work you could still feel some resistance in the ****. When you change the "mode" you should hear a very audible hiss in the dash itself.
08-04-2015, 10:12 PM
#9
TECH Veteran
You should still be able to feel the detents when moving the switch from position to position.
08-05-2015, 10:21 AM
#11
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IIRC the vaccume supply Tees in above the passangers side manifold. There is also a check valve. That is were I would start after the broken knobb. My **** on my 02 will split every couple years and I have to glue it.
